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  3. According to myth, Rwanda’s ancient line of kings descended from a man with secret knowledge: He could【B1】______ordinary rock in

According to myth, Rwanda’s ancient line of kings descended from a man with secret knowledge: He could【B1】______ordinary rock in

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问题     According to myth, Rwanda’s ancient line of kings descended from a man with secret knowledge: He could【B1】______ordinary rock into smooth, gleaming iron.【B2】______this new technology, he taught his people to make hard, durable weapons for defeating their enemies and sharp axes for cutting the forest to make fields. By the time the first Europeans arrived in the 19th century, iron had become【B3】______in the kingdom of Rwanda
    Other traditional African societies tell stories of【B4】______ironworkers who descended from heaven or came from other lands. The prevalence of such legends【B5】______the importance of ironworking in these cultures, and archaeologists have long wondered if the arrival of iron metallurgy【B6】______the growth of complex early societies. Did foreigners【B7】______bring ironworking to Africa, or did Africans invent it themselves?
    Entering the Iron Age was not easy. Metalworkers had to melt ore at【B8】______temperatures and then repeatedly hammer and reheat the spongy metal. The traditional view is that metallurgists in Turkey were the first to melt iron ore【B9】______, beginning around 1800 B.C.E. Initially, they【B10】______the new metal for precious【B11】______or ritual objects. But by 1200 B.C.E., workers in the Levant were boiling out【B12】______amounts of iron.
    The metal had a major【B13】______on societies. Iron was a transformative metal. Iron ores are much more【B14】______than copper or the tin needed to make bronze. Bronze was【B15】______costly and largely limited【B16】______use in ritual objects and goods for【B17】______. But once cultures learned to melt iron, they could put iron tools into the hands of【B18】______people for clearing forests and tilling the【B19】______. This boosted agricultural yields, increased the numbers of villages, and【B20】______ever more social complexity.
【B12】
选项 A、considerable
B、considered
C、flexible
D、immeasurable
答案A
解析 语义逻辑题。上文提到铁器仍然是得来不易的，而该句表转折的But表明这样的情况已得到改善。因此，此处空格应填入表示“相当大(或多)的”的词语，A项符合题意，意为“重大的，值得注意的，很大(或多)的”。
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